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Cask Conditioning...P65 CASK CONDITIONING Further reading Cantwell, Allen, and Forhan. Beer from the Stainless: Brewing Techniques Nov/Dec 1993 Timothy O’Rourke, Live Ale. The New Brewer March/April 1996 BarleyCorn Nov 1996 CAMRA. Cellarmanship, Caring for Real Ale (Campaign for Real Ale 230 Hatfield Road St. Albans, Herts. AL1 4LW. Great Britain) Andrew Hepworth, Live Beers in a Bottle. The Brewer April 1996 Mark Dorber, Cellarmanship. All About Beer. July 1997 14 CASK CONDITIONING Terminology Alginate Auxilary fining agent to aid in clarification of the beer in the cask. Beer engine Hand operated suction pump designed to pull the beer from the cask and dispense it into the glass. Cask Container for cask conditioned beer. Cask Breather Device that allows CO2 to flow into the cask as beer is removed. Firkin A 9 imperial gallon, or 10.8 U.S. gallon cask. Isinglass Solution of collagen protein extracted from the swim bladder of the sturgeon, it aids the sedimentation of yeast on the bottom of the cask. Keystone Bung that seals the cask at the end through which the tap is hammered. Priming Addition of fermentable sugar to the beer in the cask to feed the secondary fermentation. Racking Filling the cask. Reracking Filling a cask with cleared, or settled beer from another cask. Shive Bung that seals the cask, at the side opening, through which the cask is vented. Spile Hard/Soft Wooden or bamboo peg used to vent the cask. Stillage Rack for setting up casks for settling and serving. Tap The valve that is driven through the keystone for beer dispense, or connected to the keg to allow beer to be dispensed Tut The plug in the middle of the shive through which the spile is driven. 13 CASK CONDITIONING Flavour differences. There is no doubt that the softer carbonation and the warmer serving temperature affect the flavour of cask conditioned beer. Both carbonation and low temperatures can interfere with the perception of flavour and aroma. The additional time spent with the yeast results in a greater complexity of flavours, and fining rather than filtration means that less flavour is “filtered out” by the brewer. Dry hopping produces flavours and aromas that change as the beer ages. The higher fermentation temperatures will tend to result in more estery beers and open fermentation and the increased presence of oxygen throughout the process will result in more oxidised flavour components. It is usual to find higher levels of bacteria associated with cask conditioned beers but micro-organism character is rarely seen as a positive factor in beers prepared in this way. Summary Some brewers claim that cask conditioned beer will never take off in this country, be- cause there is not enough knowledge out there amongst the distributors, bartenders and beer drinking public. Other brewers insist that they are willing to learn what to do, and are enthusiastic about learning the traditional skills. Technology for serving the beer in accounts that aren’t ideally set up for it came from Great Britain and was made necessary by the huge number of bars that requested “real ale” once CAMRA achieved their aims. The Campaign for Real Ale is one of the most successful consumer advocacy groups in history. Formed by four beer enthusiasts in the early 1970’s, CAMRA lobbied the brewers of Great Britain to once again produce true cask conditioned beers. Disappearance of the old style of beer led to a loss of expertise in the pubs, but extensive education and train- ing programs introduced by the brewers, and by CAMRA, have increased the knowledge level ensuring that beer is served in good condition. Remember that when you decide to serve beer in cask conditioned form you are gam- bling somewhat. The reward is that you can present a beer that is at its peak of flavor and freshness, and those customers that crave a truly unique drinking experience will thank you. The risk you take is that you waste a few gallons of beer, and some investment in equipment, that has a second hand value. It is true that the public in the USA has limited knowledge and understanding of the product You have to consider whether you will scare regular customers away with extravagant experimentation, but I feel that America has more than its fair share of beer drinkers who are very adventurous and crave the unusual. 12 CASK CONDITIONING Gravity The easiest way to serve cask conditioned beer is to hammer a tap through the keystone and pour the beer directly into the glass from the tap. The cask needs to be set up behind the bar, and the bartenders trained in pouring techniques. The beer will tend to pour without much head with this method . Beer engine It is more likely that the beer will be stored away from the bar and delivered to the customers glass via a beer engine or hand pump. The beer engine is mounted on or through the bar and is basically a simple piston pump, that pulls a measured amount of beer from the cask and delivers it to the glass with a single pull. Usually they are sized to deliver 10 oz of beer per pull. They are fitted with a non return valve to prevent beer flowing back into the cask, but nothing to stop beer flowing through the pump if the cask develops enough of a pressure to push the beer. The line should be as short as possible and insulated. Since cask conditioned beers contain a significant amount of live yeast the lines must be thoroughly cleaned on a regular basis. They should not really be left overnight with beer in them and it certainly adds to the work involved in keeping cask beer to have to run water through the lines every night. Modern beer engines dispense the beer through a “swan-neck” spout, often with a sparkler attachment. In some parts of England customers demand a tight creamy head on their beer, and the sparkler is designed to force the small amount of condition in the beer into the head. Other beers benefit from being poured with a small head, and some require no head at all. In the USA cask beer is often associated with the tight creamy head so a sparkler is advisable. A company in California manufactures a device called a fizz-buster, that decarbonates regular keg beer to allow it to be dispensed via a beer engine. 11 CASK CONDITIONING leather washer and a strainer to trap hop leaves and large particles. When using a keg the first couple of pulls on the handpump may draw some sediment but after that the beer will be clear. Dispense As beer is removed from the cask or the keg then something must flow into the container to replace it. Traditionally that was just air from the room, and the problems with that are obvious. The beer will quickly lose what carbonation it does have, and be prone to infection from growth of beer spoilage micro-organisms in the air, and already present in the beer. It is possible to filter the air entering the cask, but that will not help with carbonation. Traditionally pubs would just serve from a size of container that could be emptied in 1-2 days. English brewers would not offer a price discount for larger cask deliveries to discourage ordering too much beer. If the air is replaced with CO2 then carbonation can be maintained and the detrimental effects of air in the cask eliminated. The problem is in allowing enough CO2 to enter the cask or keg without creating a pressure in the container. The cask breather was developed to allow CO2 into the cask to replace beer that has been removed and at the same time allow excess CO2 to be vented. The Campaign for Real Ale (CAMRA) opposes the use of any device that allows CO2 to be added to a cask and insists that well maintained beer, sold fresh and in prime condition does not need the extra protection of added CO2. This is undoubtably true, however, the cask breather allows customers to enjoy something very close, arguably identical beer in an account that may not have high enough sales, to rely on the traditional method. In this country it is prudent to use a cask breather until turnover reaches a level at which the bar can guarantee that it will drain a cask in a day. 10 CASK CONDITIONING with strong beers, for peak flavour development, but the beer is more often considered ready to serve once it is cleared. Temperature control The ideal serving temperature is “cellar temperature” or around 55oF. It is unusual to find a cellar that is maintained at that temperature in this country , so it is necassary to find some way to cool the cask to the correct temperature. Walk in coolers are too cold, and at that temperature beer is unlikely to clear and will look flat and cloudy when poured. The low temperature will prevent the subtler flavours and aromas from being enjoyed. Traditional evaporative cooling methods may work if the beer can be served quickly. A hessian sack is layed over the cask and kept wet. Water evaporating from the sack cools the cask underneath. Some English brewers experimented with a foot shaped probe that was inserted into the shive hole of a cask, and has ice cold water pumping through it, but that method carries with it the obvious risks of introducing some contamination to the beer. A better method is the saddle shaped cooling coil that sits on top of the cask and is covered by a decorated plastic cover.
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